Download User Manual v1.52.qxd

User’s Manual
Version 1.52
© 2005 - Chu Engineering. All Rights Reserved
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Package Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Installation
Hardware Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
© 1998 - 2005 Chu Engineering
All rights reserved.
This User’s Manual, DirectScan software, and DirectScan hardware are all property of Chu
Engineering and may not be copied, duplicated, transmitted, transcribed, stored in a
retrieval system, or otherwise reproduced in any way, shape, or form without the prior
written consent of Chu Engineering. Information presented in this manual is subject to
change without notice and does not represent a commitment on the part of the
manufacturer.
DirectScan is a trademark of Chu Engineering.
All other product names are trademarks of their respective owners.
Using DirectScan
DirectScan Menu Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Menu Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Realtime Display - Text Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Realtime Display - Dial Graphic Screen . . . . . . . . . . . . . . . . . . . . . . . .13
Realtime Display - Scope Graphic Screen . . . . . . . . . . . . . . . . . . . . . .14
Redisplay - Text Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Redisplay - Dial Graphic Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Redisplay - Scope Graphic Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Time Slip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
File Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
User Preferences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Tips and Tricks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Limited Warranty
The DirectScan hardware module, data cables, and software are warranted against
manufacturing defects for a period of one (1) year from purchase. Any item determined to
have a manufacturing defect will be repaired, replaced, or refunded at the manufacturer’s
discretion. This warranty does not cover fire, flood, abuse, neglect, improper usage,
mutilation, or destruction. This warranty also does not cover damage to any other item
caused by the improper usage of this product. Hence, the user must assume all
responsibility when using this product. Items requiring replacement or repair, but not
covered under this warranty may be assessed a repair cost. This warranty does not state
either directly or indirectly that this product will meet customer requirements, nor that it will
be error free. Please consult the place of purchase for more details.
Chu Engineering
[email protected]
http://www.ChuEngineering.com
Houston, Texas
2 DirectScan
© 2005, Chu Engineering
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Appendix A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Appendix B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Appendix C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35-37
Spare Parts Order Form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Registration Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
© 2005, Chu Engineering
DirectScan 3
Introduction
NOTICE!!!!
Thank you for purchasing DirectScan! We at Chu Engineering believe that DirectScan is
the best tuning tool available to the general Turbo Buick population. Developed and tested
by Turbo Buick enthusiasts, DirectScan takes performance tuning to the next level.
WARNING! To ensure PROPER DirectScan operation, it
is STRONGLY RECOMMENDED that you read through
and COMPLETELY understand the ENTIRE user’s
manual FIRST before attempting to install the hardware
module.
In the past, Turbo Buick scan tools were limited by the speed of the Assembly Line
Diagnostics Link (ALDL) port. This allowed a relatively slow 1 update every 1.5 seconds.
This was fine for the garage mechanic when trouble shooting basic problems. However, for
performance tuning applications such as drag racing, or for trouble shooting intermittent
problems, a faster update rate was needed. This is where DirectScan excels. By
connecting directly to the car’s computer, or the Engine Control Module (ECM), the
limitations of the ALDL port are bypassed and update rates up to 18 per second are
achievable. Connecting directly to the ECM also dramatically increases the amount of data
available to log. Not only does DirectScan provide all of the standard ALDL data, but it also
provides more indepth data such as all 16 Block Learn Multiplier values, Spark Advance,
and Injector Pulsewidth. Now, the user can see exactly what the ECM is doing as well
when. What would normally take five or six time trial passes to dial in a car can now be
accomplished in half that. The more information the user has, the better the user can tune
their Turbo Buick to it’s maximum performance.
Chu Engineering
[email protected]
This will DRASTICALLY reduce the chances of
encountering a problem during the installation process as
well as save you time.
Package Contents
The DirectScan product ships with the following items:
• DirectScan hardware interface module
• DirectScan software (3.5” high density diskette)
• ECM interface cable (a 40-pin ribbon cable)
• PC interface cable (a molded, shielded 25-pin computer cable)
• This User’s Manual
• Registration Card (in this manual)
• Spares / Replacement parts order form (in this manual)
NOTICE!!!!
4 DirectScan
© 2005, Chu Engineering
© 2005, Chu Engineering
DirectScan 5
Installation Instructions
WARNING! Be sure you are GROUNDED
before and during this installation process!!!
Chu Engineering CANNOT be responsible
Supplies Needed:
• Finger nail polish remover or lacquer thinner for damage due to STATIC electricity if the
proper grounding practices are not
• Cotton swabbed tips
followed. Maintaining good contact with a
• Needle nose pliers
grounded object is sufficient to discharge
• 1/4” socket driver
static electricity.
• Scotch Brite (recommended)
• small flat-head screw driver or single edge razor blade
Hardware Installation
connector. Note the location of the red stripe (pin 1). The location of the red stripe
MUST be correct for proper operation, otherwise possible damage may occur!
Step 5
Reinstall the screws removed from Step 1. Route the ECM interface cable as shown
towards the top of the ECM such that the cable lays on the EPROM face of the ECM.
Route ECM interface cable to here.
In order to use DirectScan, the stock ECM must be modified to allow access to the GM
Service Port. The stock ECM is located in the passenger side kick panel, directly in front of
the passenger side door hinge, and below the passenger side air vent. Make sure that the
key is off and the negative battery cable is disconnected.
Step 1
Orient the ECM such that the EPROMaccess cover is
facing you and the ECM harness is at the top. Using the
1/4” socket wrench, remove the two lower side screws.
These screws are on the lower left and lower right sides
of the ECM. Set the screws aside for Step 5.
Step 4
Red Stripe / Pin 1 location
Using the flat edge of the screw driver or
razor blade, gently scrap away the
remaining traces of the plastic coating from
both sides. Holding the screw driver/blade
perpendicular to the ‘gold fingers’ while
gently scrapping provides the best results.
Very little pressure is needed as the chemical softens the coating. Gently rubbing the gold
fingers with Scotch Brite will ensure that the fingers are clean and shiny. You must make
sure that the gold-fingers are absolutely clean before proceeding. Now that the
‘fingers’ are clean, connect the ECM interface cable as shown using the large card-edge
6 DirectScan
Step 7
Connect the free end of the ECM interface cable to
the DirectScan hardware interface module. The
connector is keyed to facilitate a one-way
connection.
Use 1/4” driver to remove screws
Step 2
Use the needle nose pliers to grab ahold of the cover flap
depicted in the figure to the right. Rock the flap up and
Insert needle nose pliers here.
down until it snaps off. Discard the flap.
Step 3
Thoroughly soak a cotton swabbed
tip in finger nail polish remover or
lacquer thinner and apply the tip to
the larger edge card ‘protrusion’.
Continue applying liberal amounts of
remover until both sides and all
Apply finger nail polish remover along this connector. edges appear clean.
© 2005, Chu Engineering
Step 6
Place the ECM back into the passenger side kick
panel in the normal factory position (EPROM face
facing the outside of the car). With the ECM now in
back in the kick panel, and in the approximate stock
location, route the interface cable up such that it
exits beneath the passenger side air-vent, inside the
dash. Opening the glove box and unlatching it to
allow a better view is recommended.
Place hardware module here.
Step 8
Connect the female end of the PC interface cable to
the male connector on the DirectScan hardware
interface module. Screw down the cable using the
two thumbscrews.
Step 9
Place the DirectScan hardware interface module in the area shown in the picture above
(beneath the air vent, to the right of the glove box, behind the dash). Orient the module such
that the ECM interface cable faces down and the PC interface cable faces up.
Step 10
The PC interface cable is 6’ long. On Turbo Buicks with a center console, this cable is long
enough to route behind the glove box, beneath the center console, and exit just between
the passenger seat and center console with about 1-2 feet to spare. This provides for a very
stealth installation, yet still allowing enough length to connect to a laptop. For vehicles not
equipped with a center console, routing the cable such that it does not interfere with driving
is the only requirement.
Step 11
Reconnect the positive battery cable. Connect the free end of the PC interface cable to the
laptop’s parallel port (a 25-pin female connector).
The DirectScan hardware interface module installation is now complete. The next step is to
install the DirectScan software onto the laptop.
© 2005, Chu Engineering
DirectScan 7
Software Installation
Using DirectScan
Although the DirectScan software may be run directly from the diskette provided, it is
strongly recommended that the software be copied over to the laptop’s internal hard drive
(if equipped). This will better facilitate faster program execution and better overall
performance.
Since there are several methods of copying the software onto the laptop’s hard drive (DOS
prompt, Windows File Manager, Windows Explorer, etc.), only the most basic method, the
DOS prompt, will be covered here. For all other methods, please consult your program
documentation.
The DirectScan software was developed to be as intuitive as possible. Therefore, you will
find that the arrow keys, ESC key, & Return key, will navigate you through most of the
program. At any time, pressing the F1 key will bring up a help screen listing all of the valid
keys for that particular screen. This key will essentially be the only key you will need to
remember as it leads to all other command keys.
Step 1
Get to a DOS prompt. For example, choosing the MS-DOS Prompt selection in Windows95
will accomplish this task.
Realtime Display
Step 2
Insert the DirectScan software 3.5” diskette into the laptop’s floppy drive. Note: The laptop
must have a high density (1.44MB) floppy drive in order to read the diskette.
Step 3
Create a directory on the hard drive called DS.
For example, typing in MKDIR C:\DS will accomplish this task.
Buffer Redisplay
Main Menu
Step 4
Copy the DirectScan program file, DS.EXE, to this directory.
For example, typing in COPY A:DS.EXE C:\DS will accomplish this task.
RPM Redline
Menu Flow
Text
Vehicle Weight
Dial
AutoGet
Scope
Trigger Method
Text
Wheel Height
Dial
Diff. Ratio
Scope
Filename Default
Update Rate
Time Slip
File Menu
Load Buffer
Label Color
Save Buffer
Info Color
Comma Del.
Highlight Color
Error Color
The program DS.EXE is the only file that is needed to run DirectScan. Any custom
preferences (discussed later in this manual) will be stored in the same directory as the
program file and will be named DSPREF.DAT.
Preferences
One Line Help
Note: To obtain maximum program performance, it is not recommended that the DirectScan
program is run under a Windows-type environment. The program is best run under native
DOS without any unnecessary Terminate-and-Stay-Resident (TSR) programs loaded into
memory. DS.EXE requires 512K of free low-DOS memory. If you are unsure of the amount
of low-DOS memory available, please consult your laptop’s user manual for further
instructions.
Menu Navigation Keys
Arrow Keys The Up & Down arrow keys move the menu highlight bar Up or Down. If
more menu options are available than what is currently displayed, a small
up or down arrow will appear to the right of the menu items indicating more
menu items in that direction.
Enter Key
The Enter key selects the currently highlighted menu option.
ESC Key
The ESC (Escape) key returns to the previous menu. In the case of the
main menu, pressing ESC will exit the program. If the current buffer
contents has not been saved, than a confirmation message will appear.
F1 Key
Pressing the F1 key will display the Menu Help screen describing these
menu commands.
<Hot Key>
Every menu item’s first character is that item’s hot key.
F10 Key
Quickly jump to the Realtime - Text Screen. This option is only available
from the main menu.
PgUp/PgDn
Moves Up/Down one menu screen-full at a time. If no more menu items
exist, the highlight bar is placed at that extreme (Top most / Bottom most).
8 DirectScan
© 2005, Chu Engineering
To start the DirectScan program, simply change to the C:\DS directory and type in DS.
For example, typing in CD \DS will change the current directory to the C:\DS directory.
Typing in DS.EXE in this directory will launch the DirectScan program.
© 2005, Chu Engineering
DirectScan 9
Basic Menu Screen
Realtime Display - Text Screen
The DirectScan main menu is shown below for reference. For consistency, all DirectScan
menus will follow this basic screen format. The menu screen has the following features:
Version & Menu name
Current Date & Time
The DirectScan Text Display screen is shown below. The Realtime screen and the
Redisplay screen (discussed later) share the same display layout with only a few minor
differences. These differences will be discussed in the Redisplay Text Screen section. This
screen has the following features.
Program Version
Realtime Mode
General
Engine
Parameters
Data File Comment
Current Menu Options
Menu Help Line
Current System Status
Within the ‘Current Status’ area, there are the following fields:
Buffer Name The file name of buffer currently loaded. If no buffer name is available (i.e.
a new buffer or nothing logged), then <none> will be displayed.
Date
The date that the buffer was logged. If no data is currently in the buffer, than
this field will be blank.
Time
The time that the buffer was logged. If no data is currently in the buffer, than
this field will be blank. Note: this is the time DirectScan was triggered to
begin logging, not the time in which the buffer was actually saved.
Pre-Trig
The amount of time stored before the trigger. This is a minimum of 14
seconds. If no data is currently in the buffer, than this field will be blank.
Post-Trig
The amount of time stored after the trigger. This is a minimum of 90
seconds. If no data is currently in the buffer, than this field will be blank.
Buffer Stat The Current ‘save’ status. If new data is present, then ‘modified’ will be
displayed in the current error color (default: red). If no data is present in the
buffer, then ‘empty’ will be displayed. Otherwise, if the current data has
already been saved, then ‘saved’ will be displayed.
Current Dir The current working directory. If the current directory path is longer than
what is displayable, than only the last 18 characters of the path will be
displayed, preceded by three dots (‘...’).
Par. Port Adr System’s detected Parallel Port Base Address.
Max fps Rate Maximum update rate currently selected. The number in parenthesis
indicates the approximate total log time available. This includes the time
available for pre-trigger & post-trigger data. This rate is user-selectable.
10 DirectScan
Status
Indicators
© 2005, Chu Engineering
Time since trigger
Data Update Rate
All 16 BLM cells
Each parameter is explained in depth in the Appendix section of this manual.
The text display screen is divided into two main sections: General Engine Parameters and
Status Indicators. The General Engine Parameters includes all numerical data such as
the vehicles speed (Speed) and engine rpm (RPM). Also included in this category are the
ECM’s 16 BLMs, or Block Learn Multipliers. This table allows the user to view all 16 BLMs
simultaneously as well as view which cell is currently being used by the ECM for fuel
delivery calculations. In the above picture, BLM block 15 is currently being used. The
Status Indicatorsshow the states of the various external switches (P/N, 3rd, 4th, etc.) and
internal ECM variables (PE Mode, DE Mode, etc.). These indicators operate much like a
dash indicator: an ON condition is represented by a back-lit indicator while an OFF condition
is represented by a dim’d indicator name. In the above figure, the ECM is currently in
LEARN mode since that indicator is ‘lit’.
Trouble Codes, if they exist, would be indicated by the message “PRESS ‘t’ FOR
TROUBLE CODES” at the bottom center of the screen, just below the update rate. If a new
code has been detected by DirectScan, this message will blink. Once the user presses ‘t’
to acknowledge and view the trouble code, the message will remain solid to remind the user
that trouble codes still exist. Once any new codes are detected, the message will again
begin to blink.
© 2005, Chu Engineering
DirectScan 11
The Time Indicator is only present when DirectScan has been triggered (triggering
methods will be discussed in the User Preferences section). Once triggered, this indicator
shows how much time has elapsed. Thus, the user can tell at a glance how much time has
passed and more importantly, approximately how much time is left to record. The amount
of time remaining is approximate since the update rate, which can be affected by slower
computers, governs the amount of time logged. DirectScan has been programmed such
that a minimum of 90 seconds can be logged. With slower computers, the update rate is
slower - which allows more time to be logged.
Realtime Display - Dial Graphic Screen
Program Version
Realtime Mode
The Update Rate shows the instantaneous update rate. This number has a maximum of
18.2 fps, or Frames Per Second. A slower computer may show a lower number, thus
indicating a lower update rate.
A note about pre-trigger data: DirectScan will log, at a minimum, 14 seconds before the
trigger provided that DirectScan has been running in the Realtime Display Mode (either
graphic or text screen) for at least 14 seconds. If this condition is not met, DirectScan will
record as much valid pre-trigger information as possible - i.e.: all information since Realtime
Display Mode was entered up to the trigger.
Keys available on this screen
<space> This key will always stop logging data. Once stopped, DirectScan will
automatically return to the main menu. If the trigger method is set to ‘space bar’,
then this key will also start logging data.
d, D
Resets the distance indicator to 0 feet. The distance indicator is always updating,
regardless of whether or not DirectScan is logging data. This is good to mark off
a particular distance, etc. As an aside, DirectScan automatically resets the
distance indicator to 0 when triggered. Therefore, there is no need to press ‘d’
after triggering to obtain the proper distance traveled during data logging.
t, T
Displays the trouble code screen, if codes exist. Once pressed, the trouble code
error message will remain ‘solid’ until new codes exist. At this point, the trouble
code error message will begin to blink again - until ‘t’ is pressed once more. This
key is not available when logging data.
<ESC> Quits this screen and returns to the main menu. Also stops all data logging, if
currently logging data.
<F1>
Brings up a help screen which displays keys valid for this screen.
<F5>
Quick-save the current log and return to the main menu. The filename used is
based upon two parameters - the base 8-character filename as specified in the
user preferences and the three digit file extension which auto-increments based
on current files in the current directory.
<F10> Quick-switches between the graphic and text display screens. This feature is not
available when logging data.
12 DirectScan
© 2005, Chu Engineering
General
Engine
Parameters
General
Engine
Parameters
Time since trigger
Status Indicators
Distance Graph
Data Update Rate
Above is the DirectScan Dial Graphic Display. The Realtime and Redisplay screens
(discussed later) share the same display layout with only a few minor differences. These
differences will be discussed in the Redisplay Dial Graphic Screen section. This screen has
the following features.
The dial screen is provides a quick visual representation of various engine parameters.
Data points which change rapidly as well as data points which can greatly aid in
performance tuning are included on this screen. Each dial is designed to provide the
maximum needle ‘sweep’ across the most useable data range. For example, although the
ECM can report a maximum of 255 MPH, a more realistic maximum of 145 MPH was
chosen. This allows the dial to have a finer resolution yet display the most common data
values.
The Status Indicators operate in the same fashion as in the Text Screen - i.e.: if the
indicator is active, that indicator is back-lit. Otherwise, only the indicator name remains.
The Time Indicator and Update Rate have the same function as in the Realtime Display Text Screen. Just as in the Realtime Display - Text Screen, Trouble Codes are also
indicated at the bottom center of the display (immediately below the distance graph). As
with the Text Screen, if any new trouble codes have been detected, the trouble code error
message blinks. Once ‘t’ has been pressed to view/acknowledge the code(s), the message
becomes solid. Any new codes detected afterwards will again blink the trouble code
message.
© 2005, Chu Engineering
DirectScan 13
The same keys are used on the Realtime Display - Dial Graphic Screen as on the Realtime
Display - Text Screen. Please reference the Realtime Display - Text Screen section of the
manual for valid key commands. The actual numerical value is displayed just below the
dial’s center (only available on the hi-resolution version of this screen) - regardless if the
needle is ‘pegged’ at its maximum.
Realtime Display - Scope Graphic Screen - cont
Program Version
Realtime Mode
The shaded RPM region, available only on the hi-resolution version of this screen, is user
selectable. It provides a visual representation of an engine’s red line area. The starting
RPM for this red line zone is set via the User Preferences (discussed further in the User
Preferences section).
The distance graph provides a visual representation of a quarter mile. The farthest left
marker indicates the 60’ distance while the center marker indicates the 1/8th mile point.
This graph will indicate distances between 0 and 1320 feet. Any greater distances will
simply ‘peg’ the bar graph at its maximum - 1320 feet. As with the dials, the actual numerical
distance is always shown above the the bar graph.
Scope
Readout of
Engine
Parameters
On systems with only CGA graphics, DirectScan will display this and other graphic screens
in their “low-resolution” versions. While the data values and layout is essentially the same,
some items have been removed to allow for better visual clarity.
Common
Engine
Parameters
Time since trigger
Distance Graph
Data Update Rate
Realtime Display - Scope Graphic Screen
New in version 1.5 is the Scope Graphic Screen. It displays any 5 data values in an
“oscilloscope” type fashion. As time progresses, the indicator line moves to the right,
placing the most recent data just to the left. When the indicator line reaches the right-most
side, it “wraps” around to the left and continues. This display has the advantage of
indicating not only what is currently occurring, but what has occurred.
[, ]
The order in which the data cycles is as follows: Speed, RPM, TPS, LV8, MAF,
Injector PW, Boost PW, EGR Duty Cycle, Battery level, A/F Ratio, Spark Advance,
Spark Retard, Knock count, O2 Volts, Acceleration, Horsepower, & Torque.
Decreases / Increases the scopes “sweep” rate. This effectively allows more data
to be shown in each window. Changing the sweep rate has no affect on the
update rate.
This screen is divided into 2 sections. On the left-hand side are the 5 Scope “windows”. On
the right-hand side are six commonly used data values.
The data value represented in each window is indicated in the window’s upper-left corner.
The upper-right window shows the actual data value while the window’s range is indicated
along the right hand side. As with the Dial Graphic Screen, if a data value is not within the
window’s displayable area, it is “pegged” at either the bottom or top of the window.
Keys available on this screen - same as with the Realtime Text/Dial screens with the
following additions:
1-5
Cycles through displayable data values for that corresponding window. The
window’s number is indicated immediately to the left of each window. If a data
item is currently displayed in another window, it will not be selectable in any other
window. Pressing <shift> key while pressing a number will cycle “backwards”.
14 DirectScan
© 2005, Chu Engineering
A note about the Update Rate. Every effort has been made to maintain the same update
rate in both the Text Screen as well as the Graphic Screen. However, due to differences
between all computers, the update rates may be different among all screens. To ensure that
the maximum update rate is obtained, it is recommended that the user set DirectScan in the
Realtime Display - Text Screen mode before logging data. The Text Screen display will
generally have a higher update rate.
© 2005, Chu Engineering
DirectScan 15
Redisplay - Text Screen
The Text Redisplay Screen shares the same layout as the
Realtime Text Screen with the following difference. In the
upper right corner of the screen, the word ‘Redisplay’ is shown
instead of ‘Realtime’.
The Update Rate now indicates the average update rate for the logged data. This number
may be lower than what was seen during the Realtime mode. This is because DirectScan
has been designed to provide the maximum update rate at all times. The update rate will
generally be higher when only a few parameters are changing as opposed to when many
parameters are changing. This is due to the extra computation time required by the
computer to calculate the the new data values.
The Time Index can now show ‘negative time’, indicated by a ‘-’ sign before the time index.
‘Negative time’ is simply the time index before the trigger. Thus if the time index indicates
-00:10.03, this means that DirectScan is displaying what occurred 10.03 seconds before the
trigger.
The user may notice that the distance indicator jumps from some number to 0 at time
index 0. This is because DirectScan automatically resets the distance to 0 when triggered.
As in the Realtime Text Screen, the trouble code message is located at the bottom center
of the screen and functions in the same manner.
Keys available on this screen
<Up>
These two arrow keys increment/decrement the time index by one time period,
<Down> respectively. The actual amount of time between time periods is dependent on
the update rate. Therefore, for the maximum 18.2 fps (frames per second), a
time period would occur approximately every 0.05 - 0.06s.
<PgUp> The PageUp and PageDown keys increment/decrement the time index by
<PgDn> approximately 3 seconds. This feature is good for quickly finding the start of a
logged run (if for example the burn-out was logged as well as the actual quartermile run), moving quickly to the middle of the run, or simply moving quickly
through the data.
<Home> The Home key returns the user back to time index 0 while the End key places
<End>
the user at the last time index recorded.
t, T
As in the case of the Realtime Display mode, this key brings up the Trouble
Code screen, if trouble codes exist. New trouble codes will cause the trouble
code error message to start blinking while pressing this key will ‘acknowledge’
the current codes and cause the trouble code message to remain solid until new
codes arrive.
0 (zero)
Pressing this key will mark the current time index as the ‘start’ index. In doing
so, the time index and distance will be reset to 0 with all following data frames
recalculated. For example, if the current data frame has a distance of 10 feet
and the next has a distance of 13, pressing 0 at the first frame will cause that
distance to be 0 and the following to be 3. This feature allows the quarter-mile
16 DirectScan
© 2005, Chu Engineering
run to be logged anywhere in the buffer - even in the pre-trigger area.
Therefore, there is no longer any need to trigger DirectScan at the exact
moment the car crosses the start line. As long as the entire run is captured, the
user can redisplay the log, determine when the car crossed the start line, and
simply hit this key. The time indices and distances will automatically be
recalculated from that point forward to facilitate easier 60’, 1/8th mile, 1/4 mile,
etc. time correlations. Performing this operation will not alter the data. The
distance relationships between each successive frame is still maintained - even
though the displayed value may be different. Therefore, if the zero’ing
operation was done by mistake, simply find the original 0 frame and press 0
again to restore the actual distance values.
<Return> Pressing this key toggles the ‘auto redisplay’ mode - indicated by the word
‘Auto’ in the upper right corner of the screen, directly to the left of the word
‘Redisplay’ (Text Screen) or directly to the left of the word ‘Redisplay’ (Graphic
Screens). This mode causes DirectScan to redisplay the logged data in realworld elapsed time. Therefore, when one second in auto mode has passed,
one actual real-world second has elapsed. This is useful when replaying the
run “in the driver’s mind”. While in the ‘auto redisplay’ mode, only the <Return>
and <ESC> keys will function, unless the data is being viewed in the Scope
Graphics Screen (discussed later). Once the last logged time index has been
reached, DirectScan will automatically turn off the ‘auto redisplay’ mode.
<ESC>
This key quits the Redisplay mode and returns to the Main Menu.
<F1>
Brings up a help screen describing these commands.
<F10>
Quickly switches between the Text and Graphic Screens.
Redisplay - Dial Graphic Screen
The Dial Graphic Redisplay Screen shares the same layout
as the Realtime Graphic Screen with the following difference.
In the upper center of the screen, just below the program
name and version, the word ‘Redisplay’ is shown instead of
‘Realtime’.
The characteristics of the Update Rate, Time Index, Distance Indicator, and Trouble
Code Messages in this screen are the same as in the Text Redisplay Screen. All other
screen characteristics are similar to that of the Realtime Graphic Screen.
The same keys are used on the Redisplay - Graphic Screen as on the Redisplay - Text
Screen. Please reference the Redisplay - Text Screen section for valid key strokes.
© 2005, Chu Engineering
DirectScan 17
KNOCK The total number of knocks
occurring in each 1/4 mile half.
While the actual knock count
number may be much different,
this indicator only displays the
number of knocks which
occurred in that section.
Redisplay - Scope Graphic Screen
As with the Redisplay Dial Graphic Screen, the Redisplay
Scope Graphic Screen is also similar in function to it’s
Realtime counter-part with one main difference. The entire log
is displayed at one time. The current time frame is depicted
by the indicator line.
The Zoom indicator (shown above) indicates the current magnification. At 1x, each
horizontal pixel represents 1 frame/update. At 2x, every 2 pixels represents one frame, and
so forth. The number below it represents how much time the current window is capable of
displaying. For low resolution screens, this number will be less than it’s high resolution
screen counterpart.
Keys available on this screen - All of the current Redisplay Screen keys are available on
this screen as well. The new keys available for this screen are:
<left>
These two keys function in the same way as their <up> / <down> counterparts.
<right>
z, Z
Zooms in / out at the current time index (increases / decrease the zoom factor).
a, A
Jumps to the Min / Max zoom factor. The minimum zoom factor is 0.25x while the
maximum zoom factor is 8x.
n, N
Returns to the default (1x) zoom factor and original time index (time 00:00.00).
c, C
Centers the window at the current time index using the current zoom factor.
1-5
Cycles through displayable data values for that corresponding window. The
window’s number is indicated immediately to the left of each window. If a data
item is currently displayed in another window, it will not be selectable in any other
window. Pressing <shift> key while pressing a number will cycle “backwards”.
The order in which the data cycles is as follows: Speed, RPM, TPS, LV8, MAF,
Injector PW, Boost PW, EGR Duty Cycle, Battery level, A/F Ratio, Spark Advance,
Spark Retard, Knock count, O2 Volts, Acceleration, Horsepower, & Torque.
Time Slip
The Time Slip screen provides a quick way of determining those stats which most racers
want. The first half of the section lists the same information found on a standard time slip.
The second half lists other vital pieces of information:
O2V
The minimum O2 Volts detected in the 1st 1/8th mile and the 2nd 1/8th mile. The
time in which these events occurred is listed next to that event. Note: The first
30’ is ignored during the minimum O2 volt calculation. This is done to prevent a
false minimum O2 volt reading when to launching the car.
RTD
Inidcates the maximum Spark Retard detected during the 1st and 2nd 1/8th mile
halves. The times in which these events occurred is listed next to each event.
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© 2005, Chu Engineering
The data generated by the Time Slip is
only as good as the buffer data. What this
means is that if the data is not properly
“zero’d”, then the starting point for all
calculations will be off. For example, if a
log file was recorded from the moment the TPS exceeded a predefined value, yet the car
did not actually move until 0.5 seconds afterwards, then all time calculations would be off
by that amount of time. To correct for this issue, use the “zero” feature in any Redisplay
screen. Please refer to the Redisplay - Text Screen section of the manual for further
instructions on how to use this feature.
If any data point is not available to the Time Slip calculation, the data displayed in this
window may be erroneous. This will especially be true for users racing 1/8th mile instead
of 1/4 mile. All time information after the 660’ indicator will not be “correct”. In cases like
this, only use the information needed and disregard the rest.
File Menu
The File Menu has three choices - Load Buffer , Save Buffer, and Save As Comma
Delimited. The first option allows the user to load a previously saved DirectScan data log
into memory for redisplay or output to comma delimited format purposes. The second
option allows the user to save the current data log in memory to the floppy or hard drive.
The final option allows an alternate save method. This method will output the data in what
is known as ‘comma delimited format’. In this format, each frame of data is saved on a
separate line, in human readable text format, and with each data point separated by a
comma. This format is ideal for importing the data into a spreadsheet program - and
subsequently graphed and printed. Due to the numerous spreadsheet programs available
on the market, an in depth explanation of how to graph the data cannot be presented in this
manual. Please consult your specific program’s manuals for aid in performing this function.
No matter which option is chosen, the user will eventually be presented with the File
Display Screen. This screen is divided into four sections: File Name, Files in current
directory, Directories, and Drives. Movement between each section is accomplished via
the TAB and Shift-TAB keys. Movement within a section is accomplished via the arrow
keys. With respect to the latter three sections, if there are more listings than is currently
displayable, than small arrows will indicate the direction in which more listings exist.
© 2005, Chu Engineering
DirectScan 19
Program Name & Version
Screen Mode
Current File
Name
Directory
Listing
Directory
File Listing
Drive
Listing
File Comment (if available)
The following figure depicts the various features of the File Display Screen.
The File Name is restrained to valid DOS filenames - i.e.: 8.3 format. A maximum of 8 valid
filename characters is allowed for the name while a maximum of 3 valid filename characters
is allowed for the extension. At most, one period (‘.’) is allowed. DirectScan will
automatically filter out invalid characters.
The Files in current directory, depicted by the heading “File(s)”, lists all files in the current
directory. The files are listed alphabetically and grouped in columns of 16 file names. A
small arrow at the bottom of the File(s) section will indicate the direction of more files, if
available.
The Directories section lists all directories in the current directory. As in normal DOS
convention, choosing the “..” directory will move the user back one directory level. At most,
8 directories are listed at any one time. A small arrow to the right of the Directories section
will indicate the direction of more directories, if available.
The Drives section lists all the drives available on the computer. Systems containing only
one floppy drive will still have drive ‘b’ listed as this is still a valid DOS drive. Choosing this
drive will simply cause the computer to ask that the user place a disk in that drive, and will
not cause any system problems. Placing the floppy in the floppy drive will be sufficient to
satisfy this request. At most, 4 drives will be listed at any one time. A small arrow to the
right of the Drives section will indicate the direction of more drives, if available.
When Saving a Buffer, DirectScan will first allow the user to select a filename - either by
using the highlight bar or by manually typing in a the name. Once selected, the user will be
prompted for a File Comment. This comment can be up to 59 characters long and can
contain any standard character (letters, numbers, symbols, and spaces). DirectScan will
automatically filter out non-standard characters. Pressing the <ESC> key at phase will
simply return the user to the filename selection phase.
Keys available on this screen
<valid filename Only available in the File Name section. Typing valid DOS filename
characters>
characters allows the user to manually enter a file name for loading or
saving purposes. DirectScan will automatically filter out any invalid DOS
filename characters.
<arrow keys>
The up & down arrow keys will move the highlight bar up and down,
respectively, in all but the File Name sections. The left & right arrow keys
are only valid in the File(s) section if more than one column of files (more
than 16 files) exist in that directory. These keys will move the highlight
bar left and right, respectively.
<BkSpc>
The backspace key is only valid in the File Name section. Pressing this
key will delete one character to the left, if there are characters left to
delete.
<Del>
Deletes the currently highlighted filename. You must be in the File Listing
Window to use this key.
<Tab>
Moves the highlight bar to the next section in the following order: File
Name, File(s), Directories (Dir(s)), Drive(s), and back to File Name. If
any section does not have any names, that section is skipped. However,
if the current screen is a Save or Save As Comma Delimited screen, the
File Name section will not be skipped.
<Shift-Tab>
Pressing this two-key combination has the reverse effect as pressing just
the <Tab> key.
<Return>
Pressing the Return key will select what is currently highlighted. If in the
File Name or File(s) section, that file name will be selected for loading or
saving, depending on what the current screen mode is. If in the
Directories (Dir(s)) or Drive(s) section, DirectScan will change to that
directory or drive.
<ESC>
Quits out of this screen and returns to the main menu. Any change in
directory or drives is remember.
<F1>
Brings up a help screen depicting these commands.
In order to output the buffer in a comma delimited format, select Save As Comma
Delimited from the File Menu. The resulting ‘menu’ screen will change slightly to indicate
the start and end time indices.
The File Comment line will display the log file’s comment - if the file is a valid DirectScan
file and if that preference is turned on by the user in the User Preferences section. Since
this requires disk access on each file, this option is not available when selecting files from
the floppy drive.
DirectScan allows the user to select alternate starting and ending indices when outputting
to comma delimited format in order to conserve on disk space as well as to make it easier
when importing the data into a spreadsheet. To select alternate start and end indices,
choose the appropriate menu option. Once chosen, the corresponding time index will be
highlighted. Changing the time index is accomplished via the Up/Dn, PgUp/PgDn, and
Home/End keys. The Up/Dn keys increment/decrement the time index by one data frame
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© 2005, Chu Engineering
© 2005, Chu Engineering
DirectScan 21
(approximately 0.05s if the update rate was 18.2 fps). The PgUp/PgDn keys
increment/decrement the time index by approximately 3 seconds. The Home/End keys
reset the time index to either 00:00.00s or the last logged time index. These keys are the
same keys, and have the same function, as the keys used in the Redisplay screens.
Pressing <Return> will accept the new time index, while pressing <Esc> will discard those
changes. Once satisfied with the start and end indices, choose Save File to proceed with
the comma delimited format output.
User Preferences
There are several user customizable User Preferences available in DirectScan. All
preferences can be altered by choosing the Preferences option from the main menu. The
resulting screen will have the following change on the right half of the screen.
The RPM Red Line is used in the graphic screen to place the “red line” hash marks on the
RPM gauge - much like a real tachometer. Use the Up/Dn arrow keys to increase/decrease
this value by 25 rpm.
Vehicle Weight refers to the vehicle’s weight, in pounds. This parameter is used in
Horsepower and Torque calculations. Use the Up/Dn arrow keys to increase/decrease
this value by 25 lbs.
The Default Filename parameter
indicates to DirectScan what to use
as the base 8 character DOS
filename during Quick Saves (a quick
save can be invoked during realtime
data logging by pressing <F5>). The
file extension used will be a simple
numeric number which starts at 0,
increments by one, and has a
maximum of 999. If a file with that
extension already exists, the
extension is auto-incremented until an
unused number is found. To change, press enter and type in a filename. Character inputs
are limited (by the program) to valid DOS characters and a maximum length of 8.
The Max fps rate parameter allows the user to “slow down” DirectScan’s maximum update
rate. On systems which can normally record the maximum 18.2 fps, changing this
parameter to 9.1, 6.1, etc. will place a maximum fps limit. However, on systems which can
normally record less than the maximum 18.2 fps, setting this value to 18.2 will not increase
the update rate. The number in parenthesis indicates the minimum log time available with
the current fps setting. This number includes the pre-trigger as well as the post-trigger time.
To change, press enter and use the Up/Dn arrow keys to increase/decrease the max fps
rate.
The following is an explanation of the different color options available on DirectScan.
The Auto-get Comment parameter indicates whether or not DirectScan should
automatically retrieve a DirectScan data file comment in the Load/Save screens. Selecting
this option will toggle parameter on & off.
There are five different Trigger Methods:
Space Bar
DirectScan will begin logging data immediately when the space bar is
pressed (in actuality, the space bar can always be used to trigger
DirectScan. Therefore, choosing the Space Bar trigger method will
effectively prevent any other method of triggering).
TPS Level
Sets DirectScan to trigger only when the TPS exceeds the user set TPS
threshold. Use the Up/Dn arrow keys to increase/decrease the TPS voltage
threshold by 0.10 volts.
Trouble Code Trigger the instant a trouble code is detected.
Non-zero retard Begins logging data at the first instance the Spark Retard is not zero.
Knock Count Change. Starts logging data when the Knock Count number changes.
Selecting Change Trigger Methods will automatically choose the next trigger method.
Both the Wheel Height and Differential Ratio are used in mph and distance correction
calculations. These two options allow the user to change these values for vehicles using
non-stock tire heights and differential ratios.
Use the Up/Dn arrow keys to
increase/decrease these values by 0.10 inches (tire height) or 0.01(differential ratio).
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Label
Used for all screen templates - i.e.: data labels, screen borders & titles.
Info
Used for all screen information - i.e.: data values & menu options.
Highlight Bar Used for the highlight bar and all items ‘highlighted’ including the ‘backlit’
color used for the Text Screen Status Indicators.
Error Color
Trouble code message color. This message appears at the bottom center
of the screen when trouble codes are present.
One Line Help The Help line appears in all menu screens at the bottom of the screen.
Selecting any color item will bring up a list of available colors. Once selected, that
parameter will change to that color. Only Text screen (i.e.: not graphic screen) colors are
affected.
All changes made in the User Preferences screen are shown in the example box only until
the changes are saved. Once saved, DirectScan will automatically load these preferences
every time it is started. The preferences file, dspref.dat, stores these preferences. If this
file is not present, DirectScan will revert back to the program defaults. Thus, if the user
desires to revert back to the default settings, simply delete the dspref.dat file. This file
resides in the same directory as the DirectScan program file, DS.exe.
© 2005, Chu Engineering
DirectScan 23
DirectScan Tips and Tricks
DirectScan’s ability to log data previously unobtainable presents the user with a wealth of
information that may be overwhelming. This section serves to provide some insight into
how one can use the extra data in performance tuning their vehicle.
One of the first noticeable major items is the BLM matrix in both Text display screens. This
matrix simultaneously shows all 16 BLMs, or Block Learn Multipliers. These 16 data values
serve as the only ‘memory’ the ECM has as to the state of engine tune, driving conditions,
and driving habits. The actual explanation of what the BLMs represent is explained in the
Appendix section of this manual. The cells are numbered 0-15 - left to right, top to bottom.
This section will discuss how to read the matrix.
At any point in time, the ECM is referencing one of the 16 cells. Which cell is determined
by the current engine RPM and the mass air flow (MAF). Generally speaking, the ECM will
only reference those cells on the diagonal from the upper left to the lower right since this
diagonal represents increasing RPM with increasing MAF. Normally, high RPM and low
MAF or low RPM and high MAF do not occur. With that in mind, looking at all 16 BLMs will
give an indication of the engine’s current state of tune. If the majority of the numbers are
above 128, than this would indicate that the ECM believes the engine to be on the lean side
- and is attempting to compensate by increasing the injector pulsewidth (a higher BLM).
However, if most of the numbers are below 128, than the opposite is true - the engine may
be on the rich side. Watching which cell is currently being used at a given RPM and MAF
can indicate, for example, if the engine is rich during mid-throttle, but lean during wide open
throttle. Of course, if all 16 cells indicate a value of 128, either the engine is perfectly tuned
or the ECM has been reset.
Another benefit of the increased update rate available from DirectScan is the ability to
generate highly detailed graphs of any engine parameter. Using DirectScan’s Redisplay Scope Screen, one can view these graphs on-line. Of particular interest are the RPM,
Horsepower (HP), Torque, O2, and MAF graphs.
The RPM graph can indicate what RPM the transmission shifted at as well as what RPM
the engine dropped to after the shift. If the RPMs drop too low after a shift, the engine could
be dropping out of its power band.
A HP and Torque graph can indicate where that vehicles peak power occurs - i.e.: at what
RPM and what gear. These numbers would be similar to the readings obtained from a
chassis dyno - except that during a race, the car is rarely left in only one gear. Also, the HP
and Torque numbers calculated by DirectScan are net values - i.e.: the power required
above and beyond that needed to overcome friction and drag in order to accelerate.
However, these values are good for measuring the amount of power gained (or lost) after a
tuning change. For example, these graphs may indicate that after a fuel pressure
adjustment, the same peak power was not generated until much later in the race. Note:
Viewing the HP data while using a chassis dyno will not produce the same results. This is
because the chassis dyno’s rollers do not present the same effective weight of your vehicle.
The formula used in DirectScan for HP and Torque calculations are based on how much
power your engine produces to move your actual vehicle - not rollers.
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© 2005, Chu Engineering
An O2 graph can give a visual representation of the car’s Air/Fuel (A/F) ratio throughout the
entire race. This can be beneficial in determining exactly where and when the engine
became lean (but recovered later).
A MAF graph can show just how much the MAF drops every time the vehicle shifts gears as well as how quickly the MAF recovers. Ideally, the MAF should always read 255 for
maximum performance. However, during gear changes, the RPM drops which in turn
reduce the air intake per unit time. This is depicted in a MAF graph.
Although DirectScan does have multiple Triggering Methods, the most convenient method
for logging a race is by utilizing the TPS level trigger. This way, all the driver needs to do is
set DirectScan in Realtime Display mode before the burn-out. The process of performing a
burn-out will trigger DirectScan since the TPS should exceed the preset threshold level.
Now, the driver can fully concentrate on the burn-out, staging, and most importantly, racing.
DirectScan has the capability to log at least 90 seconds of post-trigger data. Therefore, as
long as the car crosses the finish line within 90 seconds of triggering, the race will be
captured in memory.
For most racers, setting the TPS trigger threshold to approximately 3.00V is sufficient.
Setting it too high, i.e.: near the maximum TPS, may result in not triggering at all. Setting
the threshold too low may cause the program to trigger during the approach to the burn-out
box! The driver should base their decision of the proper trigger level on their own personal
driving/racing habits.
A unique feature of DirectScan is the ability to ‘re-center’ the logged data. This is
accomplished in the Redisplay mode by pressing the ‘0’ key at the desired time index. Recentering the data allows the user to quickly determine the 60’, 330’, 1/8th mile, 1000’, 1/4
mile, and all other time splits by simply advancing to the time index which indicates that
distance. The easiest way to accomplish this is to view the data using the Redisplay Scope Screen. While viewing the Speed and TPS windows, note when the TPS jumps to
WOT. Then, slowly increase the time index until the distance meter changes from 0 to 1.
One or two frames before this point is generally the ‘true’ starting point.
Since some racers deep stage while others shallow stage, an exact time index of when to
re-center the data cannot be determined in this manual. Each racer will have to experiment
on their own to obtain the proper re-centering time index. Once this index has been found,
pressing ‘0’ will re-center all time indices from that point forward. That index will now have
a time index and distance of 0 while all subsequent time indices will be recalculated
accordingly. Now, all the user needs to do in determining when the car crossed the finish
line is to advance to the time index where the distance reads approximately 1320’ (for a
quarter-mile track). Since the smallest time resolution is 0.05s, the actual ‘finish line’
distance may not be exactly 1320’. However, the closest time index should yield data
closely resembling that reported on the time slip - provided that the correct tire height and
differential ratio have been selected. Also, once the correct ‘0’ point has been found,
choosing the Time Slip option from the main menu can quickly generate the time splits.
© 2005, Chu Engineering
DirectScan 25
Troubleshooting
After installing the DirectScan hardware and software, all I get is rapidly changing data.
Check the ECM’s edge card connector for residual traces of the plastic coating.
Although the gold fingers may appear clean, it is possible that a thin plastic coating still
exists - thus causing a bad connection. Critical (and often overlooked) areas to check are
the edges of the connector as well as the bottom side. Since the bottom side is a bit more
difficult to see, that side is often not as clean as the top side. Liberal use of the finger nail
polish remover will remove the majority of the coating as well as soften the remaining
portion. The use of a flat sharp edge such as a small flat head screw driver or pocket knife
to gently scrape off the remaining coating may be necessary. Simply place the flat edge on
the part of the gold finger most inside to the ECM and as perpendicular to each gold finger
as possible. Then, gently scrap along the length of each gold finger towards the outside of
the ECM. Do this on both sides of the connector and especially the edges. Be careful to
not scrape too hard, or the gold finger damage may occur (a few scratches on the gold
finger is fine). Note: MAKE SURE THAT YOU ARE PROPERLY GROUNDED WHEN
PERFORMING ANY WORK ON THE ECM. STATIC ELECTRICITY CAN DAMAGE THE
SENSITIVE COMPONENTS IN THE ECM. CHU ENGINEERING CANNOT BE HELD
RESPONSIBLE FOR DAMAGE CAUSED BY IMPROPERGROUNDING TECHNIQUES.
Contamination inside the ECM side of the ribbon cable. In the process of cleaning the
ECM edge card connector, trying the connection by plugging in the ribbon cable / ECM
cable, and re-cleaning, it is possible that some of the plastic coating material can become
lodged or otherwise adhered to the inside of the ribbon cable connector. When this occurs,
you will see the same results as if the ECM edge card gold fingers were not properly
cleaned. In this case, check the inside of the connector with a flash light for any signs of
contamination. If any exists, use a small screw driver, pocket knife, thin stiff brush, or any
other tool to reach inside the connector and remove the debris.
ECM interface cable installed incorrectly. Ensure that the connection to the ECM is as
depicted in the Hardware Installation section of this manual - i.e.: the Red Strip is situated
between the two ECM edge card connections. Connecting the cable in the opposite manner
(i.e.: Red Strip is near the edge of the ECM) can at best cause DirectScan to simply not
retrieve data or worst case damage to the DirectScan module and possibly the ECM.
ECM Interface cable (40-pin ribbon cable) may be nicked or otherwise damaged.
Inspect the entire length of the cable for any nicks or cuts in the insulation. If any damage
exists, a new cable may be required. Please contact Conley’s Performance Plus for
directions on how to obtain a replacement cable. Damage due to neglect, improper usage,
abuse, flood, fire, mutilation, or destruction is not covered under the manufacturer’s
warranty. If it is believed that the cable damage found is a result of a manufacturer defect,
please contact Conley’s Performance Plus for return/warranty instructions.
The computer may be setup incorrectly. Some laptops have alternate modes for the
parallel port. One such example are those laptops which use this port to connect an
external floppy drive. In doing so, the parallel port now becomes incompatible with
DirectScan. Setting the computer’s port as a standard parallel port (also referred to as SPP
26 DirectScan
© 2005, Chu Engineering
mode) may be all that is required. This can be accomplished via the computer’s setup utility.
Although not recommended, EPP and ECP modes (two enhanced parallel port modes) may
be compatible with DirectScan. Please consult the laptop’s user manual in ensuring proper
parallel port configuration.
The computer may not be compatible with DirectScan. Although designed to be
compatible with as many different computers as possible, the possibility that some laptops
are not compatible with DirectScan still does exist, however remote. If after ensuring that
the laptop is setup correctly (standard parallel port settings, etc.), the connection to the ECM
is clean and free of the plastic coating, none of the cables are damaged, and the software
is installed correctly, you may want to contact Conley’s Performance Plus for further
assistance.
Every time I attempt to go into Realtime Display mode (text or graphic), I continue to receive
a “Hardware NOT detected! Retry?” message.
Check all connections and ensure that the key is in the ON position. The DirectScan
software automatically detects if the hardware module is installed and power is applied to
the ECM. With that in mind, ensure that (1) the ECM cable is connected both to the ECM
and the hardware module, (2) the PC interface cable is connected to both the hardware
module and the PC parallel port, and (3) the key is in the ON position. The engine does not
need to be running for DirectScan to function.
My engine stumbles and sputters only when I have DirectScan connected or am in the
process of connecting it.
Check that the ribbon cable is not installed too deep into the ECM edge card
connector. If this is the case, try pulling the ribbon connector away from the edge card just
slightly. If this solves the problem, then place a spacer between the ribbon cable connector
and the edge card using card board or other non-conductive material.
Check that you are not running the Thrasher brand chips. Some cars experience
problems when running the Thrasher brand chips in conjunction with DirectScan. Try using
a stock chip or other brand chip.
Check the ordering of power-on. The generally accepted order is as follows: With the
car and laptop off, connect the laptop to DirectScan. Next, power on the laptop, and then
start the car. At which point the DirectScan software is started does not matter. The act of
plugging / unplugging the PC cable from the laptop while the engine is running may cause
the ECM to reset.
Some cars generate higher than normal EMI radiation. All cars generate EMI - some
more than others. This EMI generally originates from the ignition system. If you suspect
that excessive EMI is the cause of corrupt DS data, please contact Conley’s Performance
Plus at (281) 540-FAST for an EMI shield.
For all other support issues, please call Conley’s Performance Plus at (281) 540-FAST
© 2005, Chu Engineering
DirectScan 27
DirectScan Error Messages
The following is a listing of all DirectScan error message and their corresponding
explanations, possible causes, and possible solutions.
Contents not saved, continue?
Occurs when attempting to enter Realtime mode or when loading a buffer from disk. This
message indicates that the buffer still contains un-saved data. Saving the current buffer to
disk or choosing YES will remedy this problem.
Contents not saved, exit?
Occurs when attempting to exit / quit the program. If modified / un-saved data still exists in
the buffer, this error prompt will appear to remind the user of this condition. The user can
save the current data or choose YES to move past this prompt.
Error Opening File for Save! or Error saving Preferences!
Occurs when attempting to save a buffer to disk, save as comma delimited, or when saving
preferences. If DirectScan encountered a problem when saving a file, then this message
will appear. Insufficient disk space or a problem with the current disk may cause this error
message.
Exit without saving?
Occurs when attempting to exit the Preferences Menu. If any preferences have been
modified (or attempted to be modified), this error message will prompt the user if those
changes are to be saved. The user can either choose YES or NO.
Failure to Initialize Graphics!
Occurs when choosing the Graphics mode in either Realtime or Redisplay mode.
DirectScan can display graphics in CGA or MCGA mode. This error message is indicating
that DirectScan could not detect at least the CGA mode. An upgrade to a laptop with more
advanced graphics capabilities may be necessary to view the graphics screens. DirectScan
can still capture or redisplay data via Text mode.
Hardware Timedout! Retry? or DirectScan hardware NOT found!
Occurs while the DirectScan is in Realtime mode. This message indicates that the
hardware module is no longer detected by the program. This could be the result of the key
in the off position, any of the cables becoming disconnected, or power loss to the car.
Please check all connections and ensure that the key is in the ON position.
Incorrect Data File version!
Occurs in the Load Buffer screen. Although possibly a valid DirectScan file, the file version
indicates that the file format is not supported by the current program version. Using the
correct program version that supports this data file version, or converting the data file to a
supported file version will be necessary. Note: The Data File structure changed between
v1.1 and v1.5. v1.1 software cannot read v1.5 data files. However, v1.5 software will read
v1.1 (and v1.0) data files.
28 DirectScan
© 2005, Chu Engineering
Incorrect hardware revision found!
Occurs when when entering Realtime mode. DirectScan has detected in incompatible
hardware module version. Obtaining either the correct DirectScan program version which
supports that hardware or the correct hardware module which supports the software is
necessary. The hardware version is written on the module label. Version 1.5 of the software
is required when using v1.5 hardware.
Not a DirectScan Data File!
Occurs in the Load Buffer screen. Only valid DirectScan data files can be loaded into
memory. This does not include DirectScan files which have been saved in Comma
Delimited Format.
Not enough memory to store data
Occurs when entering the File Menu. If DirectScan could not successfully initialize the
buffer memory, it will prevent the user from loading a saved file. Please refer to the
explanation for the Warning: Not enough memory to RECORD data! error message.
Overwrite EXISTING FILE?
Occurs in the Save or Save As Comma Delimited screen. If an existing file name is chosen
as the save file name, this error message will prompt the user if it is alright to overwrite the
existing file. Note: this will destroy the contents of the existing file.
The Buffer is EMPTY!
Occurs when attempting to either enter Redisplay mode, save the buffer, or save the buffer
in comma delimited format. This message indicates that there is no data currently in the
buffer. This is indicated in the current status section of most menu screens. Loading a
buffer or recording some data will resolve this issue.
Warning: Not enough memory to RECORD data!
Occurs when attempting to enter Realtime Display mode (either Text or Graphics Display).
This message indicates that DirectScan was unable to initialize the amount of memory
necessary to record data. When this message occurs, the File Comment field will display
the message “Not Enough Memory to Log Data - Only Real Time Display Avail.” DirectScan
requires 512KB of low DOS memory for all features. Please consult your DOS manual for
instructions on how to remove all unnecessary TSRs (Terminate and Stay Resident) as well
as how to obtain the maximum low DOS memory possible.
Appendix A
This section lists all parameters currently logged by DirectScan accompanied by an
explanation of that parameter. The parameters are listed in alphabetical order.
3rd
4th
Third gear switch status. When lit, the transmission is indicating that 3rd gear
is engaged.
Fourth gear switch status. When lit, the transmission is reporting that 4th gear
is engaged. At this time, the 3rd gear indicator should also be lit.
© 2005, Chu Engineering
DirectScan 29
A/C
Air Conditioner Request. When lit, indicates that the Air Conditioner is
requested - and that engine RPM should be increased due to extra load.
A/F Ratio Instantaneous Air / Fuel Ratio (as calculated by the ECM).
Accel
Instantaneous vehicle Acceleration in units of MPH/s - i.e.: if maintaining a
particular acceleration for 1 second, the MPH will have increased by that
magnitude after 1 second.
AE Mode Acceleration Enrichment Mode. When lit, indicates that the ECM is adding
more fuel to richen the air / fuel mixture during acceleration.
BATT
Battery Warning. If lit, indicates that the ECM believes there to be a problem
with the battery voltage.
Battery
Current car battery voltage.
BLM Update Disable When lit, the ECM is indicating that the BLM cells are currently not
updated.
BLMs
Block Learn Multipliers. This is the ECMs ‘long term’ memory. The number has
the same meaning as the Integrator; however, these numbers are changed
only after a longer period of time has elapsed. There are 16 BLMs - each
representing a particular range of RPM vs. MAF. Thus, if a given RPM and
MAF result in a lean condition, the BLM for that cell would indicate a number
greater than 128. These 16 values are the only values ‘remembered’ by the
ECM after the engine is turned off. Also shown on the Text Display Screen is
the “current” BLM. The “current” BLM is what is generally displayed by ALDLbased scan tools and is actually a separate data location within the ECM.
While this value and that highlighted in the BLM matrix generally agree, some
chip makers actually store a different value in this location.
BOOST
Boost Mode. The ECM sets this indicator when it believes that the car is
receiving boost from the Turbocharger. Since the ECM does not actually have
a manifold air pressure input, this is a calculated ‘guess’ by the ECM.
Boost PW Boost solenoid pulsewidth. Indicates the duty cycle of the boost solenoid. A
higher number indicates a longer duty cycle, thus the solenoid remains open
longer - which in turns generally indicates higher boost. The number is always
between 0 and 1.
CLR FLD Clear Flood. By pressing the throttle to approximately 3/4 maximum with the
key on, but engine off, the ECM will entire the Clear Flood mode. This mode
will shut off the injectors and allow any excess fuel to be pumped out when the
engine is cranked.
Coolant
Radiator Coolant temperature, in degrees Fahrenheit.
DE Mode Deceleration Enleanment Mode. When lit, indicates that the ECM is
decreasing the amount of fuel delivered due to deceleration.
DFCO
Deceleration Fuel Cut Off. Under heavy deceleration, a lit indicator means that
the ECM is further reducing the amount of fuel delivered as compared to DE
Mode. Often, the Injector PW number will show 0.00ms in this mode.
Distance Distance traveled in feet. This is a running total of the distance traveled. The
numerical value ranges from 0 to 65535. After 65535 feet, the distance will
‘wrap around’ back to 0 and continue.
ECM Mode Indicates what mode the ECM is in - NORM for normal operation or ALDL for
ALDL mode.
EGR DC
Exhaust Gas Recirculation Duty Cycle. Indicates the duty cycle of the EGR
valve. This higher the number, the more exhaust gasses are passed back into
30 DirectScan
© 2005, Chu Engineering
the intake.
Low Speed Fan. When lit, the ECM has commanded the low speed fan ON.
Fuel Cutoff. When a MPH or RPM limiter is reached, this indicator indicates
that injectors are shut off.
HP
Instantaneous rear-wheel horsepower. This number is a NET value - i.e.: the
horsepower required to overcome wind resistance, road friction, and other drag
forces are not accounted for. Thus, the reported value will indicate what is
being generated for that particular acceleration.
HWY SPRK MODE When lit, indicates that the ECM is in Highway Spark Mode. Generally,
this mode will yield the best fuel economy.
IAC
Idle Air Control. Indicates the position of the Idle Air Control solenoid within the
throttle body. The higher the number, the more air is allowed to pass.
Inj. PW
Injector Pulsewidth. Indicates the amount of time, in milliseconds, the ECM
commands the injectors to remain open. The number in parenthesis in the Text
Display indicates the percent of static. The dashed line in the graphic screens
indicates the static inj. PW. The static inj. PW is the maximum PW possible
for that given RPM.
Integrator The ECM’s ‘short term’ memory. This raw number indicates the ECMs
evaluation of the current air / fuel mixture. A number above 128 indicates that
the ECM is attempting to increase the amount of fuel delivered to compensate
for a lean condition. Conversely, a number below 128 indicates that the ECM
is attempting to decrease the amount of fuel delivered due to a rich condition.
Knock Cnt. The current knock count as reported by the ECM. The actual number is not
important, but rather the amount changed (increased) during a run.
Knock Rtd. Amount of Spark Retard in degrees.
LEARN
Indicates that the ECM is in learn mode. In this mode, the ECM is using data
from the oxygen sensor to constantly update the air / fuel mixture.
LOOP
Indicates whether the ECM is in OPEN loop or CLSD (closed) loop. In Open
loop, the ECM is strictly operating from pre-set internal data tables. Closed
loop indicates that the ECM is referencing the oxygen sensor for continuous air
/ fuel ratio adjustments.
LV8
Engine Load indicated in terms of a raw number. The higher the number, the
higher the engine load.
MAF
Mass Air Flow indicated in units of grams per cylinder.
MAT
Manifold Air Temperature, in degrees Fahrenheit.
Mixture
Air/Fuel ratio mix. Indicator can be either RICH or LEAN.
O2 volts
Oxygen Sensor voltage in millivolts. This number, ranging between 0 and 1.0V,
indicates the air / fuel ratio. A high number indicates a higher percentage of
fuel while a low number indicates a higher percentage of air in the exhaust.
O2 X-cnt Oxygen Sensor Cross Counts. When the air / fuel mixture changes from Rich
to Lean (or from Lean to Rich), this is considered a ‘cross count’. The actual
number is not important, but rather the rate of increase (or how fast the number
is increasing).
OL IDLE
Open Loop Idle mode. When lit, the ECM is commanding an open loop idle,
i.e.: at idle, the ECM is not referencing the oxygen sensor for continuous air /
fuel adjustments. Instead, it is controlling the engine via preset internal tables.
P/N
Park / Neutral. When lit, the ECM believes the car is in either park or neutral.
P/S
Power Steering request. When lit, the ECM commands a higher engine RPM
FAN
Fuel Off
© 2005, Chu Engineering
DirectScan 31
due to increased power steering motor load.
Power Enrichment. During heavy acceleration, the ECM enters this mode to
to add even more fuel to the mixture as compared to AE Mode.
Pgm Idle Programmed RPM Idle. This is the ECM command engine idle RPM.
PROM ID Current PROM ID in native hex format.
RPM
Engine revolutions per minute. From 0 to 3000 RPM, the RPM is indicated in
increments of 1 RPM; afterwards, in 25 RPM increments.
SES
Service Engine Soon indicator. This indicator minimicks the dash SES light.
Spark Adv. The Spark Advance as indicated in the EPROM’s internal tables.
Speed
The vehicles speed. If a non-stock tire height and differential ratio are used,
this value can indicate the actual vehicle speed if the correct data is entered in
the Preferences section.
TCC
Torque Converter Clutch lockup. When lit, the ECM is commanding the torque
converter to lockup. Note: this does not indicate the current TCC status - i.e:
this indicator will not indicate if the TCC was locked by an external switch.
Torque
Instantaneous rear-wheel torque. This number is a NET value - i.e.: the torque
required to overcome wind resistance, road friction, and other drag forces are
not accounted for. Thus, the reported value will indicate what is being
generated for that particular acceleration.
TPS
Throttle Position Sensor. Indicates the throttle position in terms of a voltage
between 0 and 5.10V. The higher the voltage, the more open the throttle blade.
Update Rate The current update rate in frames per second (fps). In Realtime mode,
indicates the instantaneous update rate. In Redisplay mode, indicates the log’s
average update rate. This number has a maximum value of 18.2 fps.
Appendix C
Appendix B
There will be some addresses which are not available for use. These include those
addresses already being logged by DirectScan as well as those addresses set aside for
DirectScan use. If one of these addresses are encountered, that entry will simply be
skipped as the program parses through the ds.ini file.
PE Mode
DirectScan has the ability to use command line options to force certain operating conditions.
These options are:
-a / -A
Forces the use of the parallel port adaptor. This will bypass the adaptor autodetection feature and setup the program to utilize the adaptor.
-c / -C
Forces CGA graphics mode. This will force the software to use the CGA
graphics mode when displaying the graphics screen - regardless of if the
system has a higher graphics mode (or none at all).
-h / -H
Bypasses the auto-detection of the Hardware Interface Module. This will force
the software to retrieve data from the parallel port - regardless of whether or
not the module is attached. This option is useful for those laptops experiencing
problems in detecting the attached hardware.
-r / -R
Automatically jump into Realtime - Text Display mode. Intead of stopping at the
main menu after start-up, the software will automatically begin displaying
realtime data. This is useful for those not wanting to press any extra
keystrokes in order to log data.
-u /-U
Use the user-defined data parameters file. This allows DirectScan to record
user-defined data addressess. The format and instructions for use are
described later in this manual. This option is of particular use for chip
programmers / developers.
32 DirectScan
© 2001, Chu Engineering
In an effort to aid chip programmers, DirectScan offers a user-defined mode which allows
the user to log up to 10 extra bytes of information and display them in one of three different
formats.
To do this, invoke DirectScan with the “-u” command line option. The DirectScan
executable directory must also contain a plain text file called “ds.ini”. This file defines the
extra addresses, number of bytes per address, and display format. The format of the file is
as follows:
<address> <# of bytes> <type>
Where:
<address>
address of the extra data point. Must be in HEX format. Valid formats
includes: 0xA5, A5, a5, and 0xa5.
<# of bytes> either 1 or 2 only. Specifies that this value is either an 8-bit or 16-bit #.
<type>
Binary, Decimal, or Hex. If Binary, <# of bytes> must be 1. This entry can
be specified either by a single character (b, d, or h) or the entire word. Only
the first letter is important.
A maximum of 10 total bytes can be logged. Therefore, this can equate to 10 seperate
address, each 1 byte in length or 5 seperate addresses, each 2 bytes in length (and all
combinations in between).
Once data has been logged, the extra data bytes can always be re-displayed. DirectScan
will automatically determine if a data file contains regular data or extra data. Therefore, the
“-u” command line option will not be needed to view a data file with extra data.
Since extra data is being recorded, that data must also be displayed. Therefore, the Text
Display screens will change to that shown on the following page.
One will immediately notice that the BLM matrix has been shifted to the right and
condensed. Also, the data points originally along the left hand side have been re-arranged
along the top of the screen.
The resulting space created in the middle-left of the screen contains the extra data values.
This space is divded into two columns. Within each column, the address of the extra data
is on the left while it’s corresponding data value is on the right. If a <type> of ‘b’ is specified,
8 characters of either ‘0’ or ‘1’ will be displayed. This indicates a logic 1 or logic 0.
Otherwise, the data value is displayed either in decimal (whole number integer) or HEX
format.
© 2005, Chu Engineering
DirectScan 33
The screen shot to the right displays
10 extra addresses, each consisting of
1 byte. The 1st, 5th, and 9th data
values are displayed as a binary
number while the 3rd and 7th are
displayed as decimal numbers. The
reamining items are displayed in HEX
format.
Notes
When displaying a number in binary,
all digits (bits) are always shown. When displaying a number as a HEX value, all digits are
always shown. Therefore, if the value is 0, and this data point is an 8-bit number, the value
00 will be shown. However, if the data point is a 16-bit number, 0000 would be shown
instead. Finally, when displaying a number as a decimal number, the number is displayed
normally. Therefore, for an 8-bit number, a value from 0 - 255 will be shown. For a 16-bit
number, a value from 0 - 65535 will be shown.
The Dial Graphic Screen does not alter to accomodate the extra data bytes.
The Scope Graphic Screen will have added selections due to the extra data bytes.
Normally, when a user presses a window number (i.e.: 1) to scroll through the available
selections, the user would reach Torque and then wrap back to Speed. However, when
logging or viewing extra data, these items fall in line after the last selectoin. Therefore, in
the example depicted above, the selections after Torque would be 0x0F, 0x3D, 0x8C, etc.
Instead of the name of the data point being displayed, the address of the extra byte will be
displayed in the upper left of each scope window.
For binary data, the 8 data bits will be displayed in the upper right of each scope window.
The scope window will contain 8 seperate lines - each indicating a bit. The bits are ordered
from bit 0 at the bottom to the bit 7 at the top (this is indicated along the right side of the
scope window). As a bit toggles from a 0 to a 1, that line will transition from a “low” position
to a “high” position. Similarily, when a bit toggles from a 1 to a 0, the corresponding line
transitions from a “high” to a “low”.
34 DirectScan
© 2005, Chu Engineering
© 2005, Chu Engineering
DirectScan 35
Notes
36 DirectScan
Notes
© 2005, Chu Engineering
© 2005, Chu Engineering
DirectScan 37
2
PC Interface cable (molded 25 pin shielded cable)
3
Hardware interface module
4
ECM interface cable (40 pin ribbon cable)
User’s Manual
Shipping is included within the Continental U.S.
DirectScan is a product of Chu Engineering. All products purchased
through this spares / replacement form will carry the same limited
warranty as described in the DirectScan User’s Manual. Please
contact Conley’s Performance Plus for more details.
38 DirectScan
Total Price
$5.00
$30.00
$200.00
$15.00
$5.00
Sub Total
tax (if applicable)
Total
© 2005, Chu Engineering
© 2005, Chu Engineering
DirectScan 39
DirectScan Registration Card
Unit Price
Please fill out the following information, affix postage on the reverse side, and drop in the mail box to register your
copy of DirectScan. Registering DirectScan will enable us to keep you informed of the latest DirectScan news and
updates, enable you to qualify for future special offers and/or discounts on Chu Engineering products, and establish
ownership for warranty purposes. So, please take the time to fill out this card and drop it in the mail box.
Thank you,
Chu Engineering
Description
Software diskette - 3.5” high density
Name:
Qty?
1
Address:
Item #
City / State / Zip:
or, phone the order: (281) 540-FAST
or, fax the order to: (281) 548-AFAX
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Check / Money order
Phone: (
Make checks payable to and mail to:
Conley’s Performance Plus
1443-A Aldine Bender
Houston, TX 77032
E-mail address:
Payment method:
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Type:
Number:
Expiration date:
Where purchased:
In the event that you would like to purchase DirectScan spare / replacement parts, this form
has been prepared to help simplify the ordering process. Please check the appropriate
box(es) for the item(s) that you wish to purchase. Then, either fax, mail with payment, or
phone in your order to the address listed below.
Date purchased:
4
Price purchased:
3
Software:
2
Hardware:
Serial Number:
1
Computer DirectScan is used on:
DirectScan ver.:
DirectScan Spares / Replacement Parts
Order Form
Affix
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Here
Chu Engineering
P.O. Box 691953
Houston, TX 77269-1953
This manual assembled on PC and Macintosh workstations using QuakXpress 5.0 and Photoshop 4.0.
First printing April 1998. Copyright 2005 Chu Engineering